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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 252 · 40 questions
TalentJR

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

NameDateTime takenScore ___ / 40
  1. 1.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  2. 2.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  3. 3.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points left (b) points straight up (c) points up and right (d) points up and left
  4. 4.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
  5. 5.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  7. 7.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  8. 8.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  9. 9.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  10. 10.🦾 A servo moves from 40° to 180°. How many degrees does it turn?
  11. 11.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  12. 12.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 20
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  14. 14.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  15. 15.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  16. 16.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and left (b) points up and right (c) points right (d) points straight up
  17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  18. 18.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  19. 19.🦾 A servo moves from 150° to 100°. How many degrees does it turn?
  20. 20.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
  22. 22.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  23. 23.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  24. 24.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
  25. 25.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  26. 26.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle + 30
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  27. 27.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points straight up (b) points left (c) points right (d) points up and right
  28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  29. 29.🦾 A servo moves from 20° to 130°. How many degrees does it turn?
  30. 30.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
  31. 31.🦾 A servo moves from 70° to 50°. How many degrees does it turn?
  32. 32.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  33. 33.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 20
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  34. 34.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 30
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  35. 35.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  36. 36.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  37. 37.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  38. 38.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
  39. 39.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  40. 40.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False

Answer key

  1. 80
  2. 70
  3. points left
  4. swap its two wires
  5. False
  6. 200
  7. a DC motor
  8. False
  9. True
  10. 140
  11. 20
  12. 40
  13. 150
  14. 50
  15. False
  16. points up and left
  17. 300
  18. True
  19. 50
  20. 170
  21. a DC motor
  22. True
  23. a servo motor
  24. 180°
  25. a DC motor
  26. 150
  27. points straight up
  28. 100
  29. 110
  30. 40
  31. 20
  32. True
  33. 130
  34. 100
  35. a servo motor
  36. a servo motor
  37. False
  38. a servo motor
  39. True
  40. True

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